Five Metropolitan Police officers have been injured after a police boat struck Westminster Bridge in central London.
The Met said the incident occurred at about 15:40 BST and involved a boat from the Marine Policing Unit which was carrying armed officers.
In a statement, it said “a number of officers entered the water, but were recovered” adding it was waiting for an “update on the extent of their injuries”.
No members of the public are thought to have been involved or injured in the crash.
Officers who had been recovered from the river were seen being treated by paramedics on a rigid black inflatable boat moored to the side of the river.
Members of the public have been cleared from the area and a large number of police officers, fire crews and ambulances are at the scene.
A cordon has been placed either end of the bridge, which crosses the River Thames next to the Houses of Parliament, and buses and coaches travelling on it were forced to reverse and find another route.
In a statement, a spokesperson for the Met Police said: “We understand five officers were injured and are receiving treatment.
“We await an update on the extent of their injuries.
“At this stage, we don’t believe any members of the public were involved or injured.
“The circumstances of the incident will be thoroughly reviewed, but at this stage our priority is the wellbeing of the officers involved.”
A London Fire Brigade (LFB) spokesperson said: “We’re responding to an incident on the River Thames near Westminster Brigade alongside partner agencies.
“The Brigade’s fire boat and three fire rescue units with water rescue capabilities, have been mobilised to the scene. We were called at 15:58 and remain on scene.”
A Port of London Authority (PLA) spokesperson said: “We are aware of an incident involving a police vessel at Westminster Bridge.
“We are supporting the response and providing assistance where needed, working closely with the Metropolitan Police, HM Coastguard and partner agencies to manage the situation.”
A police helicopter and an air ambulance were seen circling above.
Some entrances to Westminster Underground station have been shut, Transport for London (TfL) has confirmed.
Uber Boat, which operate the Thames Clippers, said some of its services may be subject to disruption or delay as a result of the incident.
A fire service boat was seen towing a black rigid police boat thought to have been involved in the accident down the River Thames away from Westminster Bridge.
PA MediaMother and son Cecilia Lusevic, 56, and Mateo Bilis-Lusevic, 12, said they heard a loud bang when the police boat crashed into Westminster Bridge and then watched as the officers were rescued from the Thames.
The visitors from Chile were on a river tour boat on the north side of the central London bridge when they saw the incident. They were evacuated from their vessel shortly after.
Mateo said: “Two boats were riding extremely fast through the water.
“Suddenly, I heard a boom. I was looking towards the boat, and I heard a boom.
“Then three people went flying into the water and one of the people was really hurt.”
He said the officers were in the water for about 10 minutes and a life ring was thrown for one of them.
A black rigid inflatable boat arrived to help them out of the water – the same boat that witnesses said they saw paramedics treating the casualties aboard.
Mateo said emergency services then also arrived.
